Now while I might be some noob that hasn't made his roleplay character yet, ( I'm working on it, honest ) I do know a thing or two about swords.
A two-handed katana, nodachi or odachi, however you want to say it...they were conventionally used on horseback. A long blade makes for a safe bet when swinging on top of your high-horse, but they were impractical in other situations because of their unwieldy length. Hell, most people who had one either had the blade out for the entirety of a battle, or had someone who specifically carried their sheathed sword, as it would be very hard to draw alone in any quick fashion.
Not to mention someone else ([member="Isley Verd"]) said that most other people on here are fighting with weightless rave-sticks. Your choice'd be a handicap, to be sure.